Chuck.



E. G. PEGK.

CHUCK. APPLICATION FILED MAR.27, 190v.

Patented Nov. 7, 1911.

Lie/enter! onrrnn sTaTns PATENT @ETTQE.

EUGENE C. PECK, OF CLEVELAND, OHIO ASSIGNOR TO THE CLEVELAND TWIST DRILLCOMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

CHUCK.

To all whom it may concern:

Be it known that I, EUGENE C. PECK, a citizen of the United States,residing at Cleveland, in the county of Guyahoga and State of Ohio, haveinvented a certain new and useful Improvement in Chucks, of which thefollowing is a full, clear, and exact description.

My invention relates to drill chucks and is more particularly directedto that style of chuck which is adapted to receive and hold drill shankshaving two opposite longitudinal V grooves therein.

The object of the invention is to provide a form of chuck which shallovercome those defects present in the drill chucks now known, such asliability of the jaws slipping and the hood to yield to sidewise strainand the lack of sufficient side bracing to prevent the shearing of thejaws. To achieve these results, I have embodied my invention in concreteform as described in the following specification and illustrated in theaccompanying drawings in which- Figure 1 is a side elevation partlybroken away and in section, showing the assembled chuck. Fig. 2 is aview similar to Fig. 1 showing the chuck body. Fig. 3 is an end view ofthe assembled chuck. Fig. 4 is a side view showing a jaw. Figs. 5 and 6are respectively views of opposite ends of a jaw.

I provide the body A of my chuck with a threaded portion A designed toreceive a hood B having an internal thread B and an internal conicaltaper B Back of the threaded portion A on the body I provide acylindrical bearing surface A adapted to receive the rear end B of thehood which is closely fitted thereto. The forward end of the body beyondthe threaded portion is reduced and slotted at- A to receive theradially reciprocative V jaws C which, in the present instance, areshown as two in number and provided with suitable retaining means toprevent them from dropping through their respective slots, the meansshown consisting of a rod spring C extending through the length of thejaw and resting at each end upon a ledge A at the end of the slot. Theoutside of the jaws is given a conical taper G to fit the interiorconical taper B of the hood while the apex C of the V edge of the jawsis straight lined to fit the V groove in the shank of the drill. Theextreme forward end A of the chuck Specification of Letters Patent.

Application filed March 27,1907.

Patented Nov. 7, 1911.

Serial No. 364,762.

.body is cylindrical in curvature and concentric with the cylindricalbearing surface A previously described as located behind the threadedportion of the body. The hood is fitted to the bearing surface A at theforward end of the body. It is further to be noted that the forwardhearing A extends entirely around the tool-receiving openin and thusbridges the forward ends of the jaw slots A so that there is onecontinuous band of metal at this end of the chuck. I

also prefer that small projections A be formed on this band immediatelyin front of the jaw slots, which additional pieces of metal not onlyincrease the strength of the band at this point but serve as indicesprojecting from between the hood to indicate to the operator thealinement to observe in inserting his tool shank into the chuck in orderthat the grooves may coincide with the jaws of the chuck.

From the structure above described, it will be evident that, uponrotating the hood in the ordinary manner to the right, the cone of thehood will pass up on the jaws and advance them with a parallel motioninto the grooves in the shank of the tool. It is further to be observedthat the hood, which backs the gripping jaws and receives the tremendouspressure to which the jaws are subjected, tending to move them out oftheir true concentric position, is provided with fitted concentricbearing surfaces near its extremities, beyond each end of the grippingjaws, thus providing the most rigid and secure bracing possible so thatthere is no means by which it could possibly give or vibrate.

It will be seen that the sidewise twist given to the jaws is resistedalong their sides and at each end thus preventing them from twisting orbeing sheared off at some point intermediate their ends. Again, it is tobe noted "that the sides of the jaw slots are, in my construction,closed and tied together at both ends so that although the sides of theslot receive and take up the side twist given to the jaws, neverthelessthey will not split or spring, except under a pressure which would bursta cylinder so slotted.

The gripping jaws fit rather closely the slots in which they float andany unevenness in their movement would probably cause them to bind. Itwill be seen, on referring to the drawing, that I have formed ahorizontal opening through each jaw, which opening is adapted to receivethe supporting spring but which has a bearing surface for such springlocated so as to insure that the resultant thrust or tension of thespring shall be exerted along a line passing approximately through thecenter of the jaw. This will give an even movement of the jaw throughthe slot in which it floats so that there will be no binding or crowdingat either end or side.

Having thus described my invention, 1 claim:

1. A chuck having an integral body provided with supporting bearingsurfaces at its ends and being provided with slots intermediate of saidbearing portions, the said chuck body being screw threaded between therear bearing surface and the rear end of the slots, aws mounted in saidslots, said jaws being tapered upon their upper sides, a hood mountedupon the said body and having a portion of its inner surface taperedcomplementarily to the taper upon the aws, the said hood having portionswhich bear upon the bearing surfaces upon the chuck body, the interiorportion of said hood being provided with screw threads which engage withthe screw threads upon the body of the chuck, substantially asdescribed.

2. A chuck having a slotted body, jaws mounted in said slots and havingresilient members adapted to travel in extensions of said slot, and ahood for actuating said jaws.

3. A chuck comprising in combination, a chuck body having jawsresiliently mounted in slots therein, said chuck body terminating atopposite ends in concentric smooth bearing surfaces, a hood mounted 011said chuck body and adapted to move longitudinall on said oppositelyarranged bearing surfaces to advance the said jaws toward the axis ofthe body.

4. A chuck having an integral body with concentric supporting surfaces,an axial bore, a screw thread and a plurality of radial slotsintermediate said supporting surfaces, jaws mounted in said slots andhaving longitudinally-arranged, resilient members adapted to move inextensions of said slots, and an actuating hood having at itsextre1nities supporting surfaces fitted to the concentric surfaces ofthe body and a screwthread and conical surface intermediate itssupporting surfaces.

5. A chuck having a body with slots therein, jaws in said slots, a hoodadapted to operate said jaws and inclosing the same, and lugs projectingfrom said chuck body so as to be visible and located to serve as indicesfor the position of the jaws.

In testimony whereof, I hereunto aflix my signature in the presence oftwo Witnesses.

EUGENE C. PEOK.

lVitnesses:

E. B. GILCHRIST, H. R. SULLIVAN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

